Capter3
Function
Setting and Basic Operation
Curve Tracer CS-5000 Series Instruction Manual
3-53
3.10.4.1
DOT cursor
It displays x-shaped cursor on the characteristic curve. Both HORIZ and VERT display the
measurement value of DOT position.
Pushing FUNCTION knob allows the cursor to move to the same position (index) of the curve
with the next Step number. Rotating FUNCTION knob allows the cursor to move
to the measurement point (index) on the characteristic curve.
The values of vertical (VERT) and horizontal (HORIZ)
axes for cursor position are displayed in the area under
the menu.
Measurement value display when multiple characteristics curves exist
When multiple characteristics curves exist as shown in the upper-right diagram, measurement
values displayed in the area under CURSOR menu are classified into "index" and "step" as shown
in the upper-left diagram.
- step: "0, 1, 2, …" is displayed in the order of measuring the characteristics curve.
- index: The measurement point in DOT position is expressed.
Ex.: In the case of diagram above, the measurement point is the 254th point.
If DOT cursor is changed to fLINE cursor or FREE cursor, the value is displayed in the same
manner.
Display of output level of the step generator
For DOT cursor, the output value from the step generator (STEP
voltage value or STEP current value) is displayed in ( ) which is obtained
by the following calculation, as shown in the right diagram.
STEP voltage value (or STEP current value)
=
OFFSET value
+
STEP
×
STEP width
For FREE cursor in Section 3.10.4.3, value is displayed in the same manner.
Source setting of step generator: CURRENT
β
(DC current amplification factor) of the cursor position is displayed.
β
=
Current value at the cursor position/(STEP current
×
step No. of cursor position
+
Offset
current)
If DOT cursor is changed to FREE cursor, the value is displayed in the same manner.
Source setting of step generator: VOLTAGE
gm (transconductance) is displayed.
gm
=
Current value at the cursor position/(STEP voltage
×
step No. of cursor position
+
Offset
voltage)
Note: When the vertical axis is set to STEP, the parameter above is not calculated.
If DOT cursor is changed to FREE cursor, the value is displayed in the same manner.